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November 4, 2017

Fiji 8-year periodical Nanai aka Raiateana knowlesi 🇫🇯

Filed under: Fiji,Raiateana — Dan @ 1:25 am

Fiji $100 note

Update (11/4/2017): from Facebook, it looks like folks are finding them. Here’s an image.

Update (9/13/2017): the Nanai have begun to emerge! This cicada last emerged in 2009 in Nadroga-Navosa and Serua Provinces, and now again emerge in 2017. People in Fuji will be able to report sightings to nanai-tracker.herokuapp.com.

Notes from Chris Simon:

Early this morning I got the first Reports of the 8-year periodical Nanai emerging in Navosa, Fiji! Some people in that area had them for dinner.

This confirms earlier reports of the eight year periodicity. There was some uncertainty because the original specimens were dated (1906) a year later than they would be if on the current 8-year schedule.

Duffels and Ewart (1988, The Cicadas of the Fiji, Samoa, and Tonga Islands, their taxonomy and Biogeograohy) noted that, “Until recently the present species is only known from three males collected in “Fijii” in 1906 by C. knowles.” Duffels was not able to describe them when he first saw the specimens because they were missing the male genitalia. After obtaining, “a series of females and two males” from Dick Watling and Andrew Laurie in 1986, Duffels was able to assign it to the genus Raiateana. There is one other species of Raiateana in Fiji, R. kuruduadua (two subspecies in Fiji and one in Samoa) but it is not periodical as far as we know.

You might be familiar with American periodical cicadas (Magicicada) and the World-cup synchronized Chremistica ribhoi of India, but Fiji has a periodical cicada too: the 8-year periodical Nanai cicada aka Raiateana knowlesi.

It also appears on Fiji’s $100 note.

There’s even a local legend about the cicada.

More information:

Thanks to Chris Simon of the University of Connecticut for this information.

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